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Home >
Electronics Tutorials >
C Language
Tutorial > ctype.h
- ctype.h |
C Language Programming Library
Reference Guide
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ctype.h
- ctype.h
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The ctype header is used for testing and converting characters.
A control character refers to a character that is not part of
the normal printing set. In the ASCII character set, the control
characters are the characters from 0 (NUL) through 0x1F (US),
and the character 0x7F (DEL). Printable characters are those
from 0x20 (space) to 0x7E (tilde).
Functions:
isalnum();
isalpha();
iscntrl();
isdigit();
isgraph();
islower();
isprint();
ispunct();
isspace();
isupper();
isxdigit();
tolower();
toupper();
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